// 登录页面
<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像 -->
      <div class="avatar_box">
        <img
          src="../assets/logo.png"
          alt=""
        >
      </div>
      <!-- 登录表单区域 -->
      <el-form
        label-width="0px"
        class="login_form"
        :model="loginForm"
        :rules="loginFormRules"
        ref='loginFormRef'
      >
        <!-- 用户名 -->
        <el-form-item prop='username'>
          <el-input
            prefix-icon="iconfont icon-user"
            v-model="loginForm.username"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop='password'>
          <el-input
            prefix-icon="iconfont icon-3702mima"
            v-model="loginForm.password"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button
            type="primary"
            @click="login"
          >登录</el-button>
          <el-button
            type="info"
            @click="loginFormRef"
          >重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 方便ajax传参
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单校验规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置
    loginFormRef () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      // 发起ajax前发起校验
      // validate()返回一个promise
      // this.$refs.loginFormRef.validate().then(bool => {
      //   console.log(bool)
      // }).catch(err => { console.log(err) })
      this.$refs.loginFormRef.validate(async bool => {
        if (!bool) return
        // 解构赋值把请求过来的数据对象里面的data赋值给res 相当于 res = this.$http.post('login', this.loginForm).data
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 把token存储到本地
        // 加上window性能更好 不用去通过作用域链查找
        window.sessionStorage.setItem('token', res.data.token)
        // 跳转到home
        this.$router.push('/home')
      })
    }
  },
  computed: {},
  watch: {},
  filters: {},
  components: {},
  created () { },
  mounted () { }
}
</script>

<style scoped lang='less'>
.login_container {
  background-color: #2d4d6d;
  height: 100%;
  .login_box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    .avatar_box {
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 130px;
      height: 130px;
      padding: 3px;
      background-color: #fff;
      border: 1px solid #eee;
      border-radius: 50%;
      box-shadow: 0 0 5px #ddd;
      img {
        width: 100%;
        height: 100%;
        background-color: #eee;
        border-radius: 50%;
      }
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  // display: flex;
  // justify-content: flex-end;
  text-align: right;
}
</style>
